Drinking cup



FIG. 1 is a perspective view of a drinking cup showing our new design;

FIG. 2 is a side elevational view thereof; all sides being the same;

FIG. 3 is a top plan view thereof; and,

FIG. 4 is a bottom plan view thereof.

The broken lines in the drawing depict portions of the drinking cup that form no part of the claimed design. 

CLAIM The ornamental design for a drinking cup, as shown and described. 